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Draft Environmental Impact Report Page VI-2 Forward Landfill Expansion • Additional traffic would contribute to an unacceptable Level of Service at the intersection of Austin Road and Arch Road under cumulative conditions. This would be significant and unavoidable. • The project plus cumulative traffic would result in unacceptable travel speed on northbound Austin Road during the PM peak. This would be significant and unavoidable. • The project would contribute to cumulatively significant loss of agricultural lands. This could be mitigated to a less than significant level with measures identified in this EIR. • The project would traffic noise, including project truck traffic,would be significant and unavoidable. • The project would contribute to a cumulatively significant and unmitigable increase in air pollutant emissions. No cumulatively significant impacts were identified for several topic areas, including Public Health and Safety, Hydrology and Water Quality, Soils and Geology, Vegetation and Wildlife, Public Services and Utilities, Cultural Resources, and Visual Quality. C. SIGNIFICANT UNAVOIDABLE ADVERSE IMPACTS Potential project-specific and cumulative impacts of the construction, operation, and closure of the proposed expanded landfill were evaluated, and,where possible, mitigation measures were identified that would reduce the impacts to a less-than- significant level. After mitigation, the following unavoidable significant impacts that would result from project implementation were identified: • Project-related noise would contribute to a significant unavoidable increase in ambient noise levels associated with truck traffic. • The project would contribute to a cumulatively significant increase in air pollutant emissions; • The increase in height and mass of the proposed project would constitute a significant visual impact. D. SIGNIFICANT IRREVERSIBLE ENVIRONMENTAL CHANGES Expansion of the existing Forward Landfill would cause the following irreversible environmental changes: • Permanent modification of landscape and topography, as evidenced by irreversible changes in site land surface contours, drainage contours, and elevation. The appearance of the landfill would be permanently altered by emplacement of waste. The increase in elevation would be apparent even after mitigation activities were completed, and would be visible from several off-site locations, especially along Austin Road. • Landfill leachate could degrade water duality over time, requiring water quality monitoring and possible implementation of control measures. This could be a long-term impact, as leachate gradually escapes from the landfill over an extended period of time.